/Engine/Plugins/Online/OnlineFramework/Source/Party/Public/SocialToolkit.h
virtual void OnSendFriendInviteComplete ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & InvitedUserId, const [FString](API\Runtime\Core\Containers\FString) & InviteeName, bool bInviteSuceeded, const [FString](API\Runtime\Core\Containers\FString) & InviteError )